Abstract
The application of a large number of power electronic devices has caused great changes in the fault characteristics of the AC system, and the existing protection schemes are facing great challenges. This paper first analyzes the transient current waveform characteristics of AC line faults in different scenarios such as pure AC system, DC transmission system, and new energy grid connection, and then uses the correlation coefficient to identify the transient current waveform, and a new protection principle is proposed. Finally, the new protection scheme requirements on the transformer, sampling frequency and data window length are analyzed. The correctness of the analysis conclusion is verified based on EMTDC / PSCAD simulation.
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